Vinylidene fluoride-based resin film, solar cell back sheet, and solar cell module

Abstract

Provided is a vinylidene fluoride-based resin film resistant to pinhole generation caused by dispersion insufficiency and superior in thermal stability during molding processing, even if it contains a pigment in a large amount, and a solar cell back sheet and a solar cell module comprising the same. A vinylidene fluoride-based resin film is prepared by blending a vinylidene fluoride resin, a methacrylate ester resin, a titanium oxide surface-treated with alumina, silica, and zirconia, and a polyethylene glycol fatty acid ester and/or the derivative thereof at a certain ratio. Used then was a surface-treated titanium oxide with alumina, silica, and zirconia, having a total deposited amount of alumina, silica, and zirconia of 5 to 15 mass % and a deposited amount of zirconia of 0.5 mass % or more and less than 2.0 mass %.

1 . A vinylidene fluoride-based resin film, comprising
 a vinylidene fluoride resin,   a methacrylate ester resin,   a titanium oxide surface-treated with alumina, silica, and zirconia, and a polyethylene   glycol fatty acid ester and/or the derivative thereof, wherein   the total amount of alumina, silica, and zirconia deposited on the titanium oxide is 5 to 15 mass %, and the amount of zirconia deposited thereon is 0.5 mass % or more and less than 2.0 mass %.   
     
     
         2 . The vinylidene fluoride-based resin film according to  claim 1 , wherein
 the titanium oxide is contained in an amount of 10 to 25 parts by mass and the polyethylene glycol fatty acid ester and/or the derivative thereof in a total amount of 0.1 to 5 parts by mass,   with respect to 100 parts by mass of the resin component consisting of the vinylidene fluoride resin: 70 to 95 mass % and the methacrylate ester resin: 5 to 30 mass %.   
     
     
         3 . The vinylidene fluoride-based resin film according to  claim 2 , wherein the titanium oxide content is 12 to 20 parts by mass. 
     
     
         4 . The vinylidene fluoride-based resin film according to  claim 1 , wherein the total amount of alumina, silica, and zirconia deposited on the titanium oxide is 6 to 12 mass %. 
     
     
         5 . The vinylidene fluoride-based resin film according to  claim 1 , wherein the amounts of alumina and silica deposited on the titanium oxide are respectively 2.5 mass % or more and the amount of zirconia deposited thereon is 1.0 mass % or more and less than 2.0 mass %. 
     
     
         6 . The vinylidene fluoride-based resin film according to  claim 1 , wherein the titanium oxide is surface-treated with an organic matter. 
     
     
         7 . A solar cell back sheet, comprising the vinylidene fluoride-based resin film according to  claim 1 . 
     
     
         8 . A solar cell module, comprising the solar cell back sheet according to  claim 7 . 
     
     
         9 . The vinylidene fluoride-based resin film according to  claim 2 , wherein the total amount of alumina, silica, and zirconia deposited on the titanium oxide is 6 to 12 mass %. 
     
     
         10 . The vinylidene fluoride-based resin film according to  claim 3 , wherein the total amount of alumina, silica, and zirconia deposited on the titanium oxide is 6 to 12 mass %. 
     
     
         11 . The vinylidene fluoride-based resin film according to  claim 2 , wherein the amounts of alumina and silica deposited on the titanium oxide are respectively 2.5 mass % or more and the amount of zirconia deposited thereon is 1.0 mass % or more and less than 2.0 mass %. 
     
     
         12 . The vinylidene fluoride-based resin film according to  3 , wherein the amounts of alumina and silica deposited on the titanium oxide are respectively 2.5 mass % or more and the amount of zirconia deposited thereon is 1.0 mass % or more and less than 2.0 mass %. 
     
     
         13 . The vinylidene fluoride-based resin film according to  4 , wherein the amounts of alumina and silica deposited on the titanium oxide are respectively 2.5 mass % or more and the amount of zirconia deposited thereon is 1.0 mass % or more and less than 2.0 mass %. 
     
     
         14 . The vinylidene fluoride-based resin film according to  claim 2 , wherein the titanium oxide is surface-treated with an organic matter. 
     
     
         15 . The vinylidene fluoride-based resin film according to  claim 3 , wherein the titanium oxide is surface-treated with an organic matter. 
     
     
         16 . The vinylidene fluoride-based resin film according to  claim 4 , wherein the titanium oxide is surface-treated with an organic matter. 
     
     
         17 . The vinylidene fluoride-based resin film according to  claim 5 , wherein the titanium oxide is surface-treated with an organic matter. 
     
     
         18 . A solar cell back sheet, comprising the vinylidene fluoride-based resin film according to  claim 2 . 
     
     
         19 . A solar cell back sheet, comprising the vinylidene fluoride-based resin film according to  claim 3 . 
     
     
         20 . A solar cell back sheet, comprising the vinylidene fluoride-based resin film according to  claim 4 .